<template>
    <div id="aCoursesList" class="bg-fa of">
        <!-- /课程列表 开始 -->
        <section class="container">
            <header class="comm-title">
                <h2 class="fl tac">
                    <span class="c-333">全部课程</span>
                </h2>
            </header>
            <section class="c-sort-box">
                <section class="c-s-dl">
                    <dl>
                        <dt>
                            <span class="c-999 fsize14">课程类别</span>
                        </dt>
                        <!-- 一级分类 -->
                        <dd class="c-s-dl-li">
                            <ul class="clearfix">
                                <li>
                                    <a title="全部" href="#">全部</a>
                                </li>
                                <li v-for="(item, index) in subjectNestedList" :key="index" :class="{active:oneIndex == index}">
                                    <a :title="item.title" href="#" @click="searchOne(item.id, index)">{{item.title}}</a>
                                </li>
                            </ul>
                        </dd>
                    </dl>
                    <dl>
                        <dt>
                            <span class="c-999 fsize14"></span>
                        </dt>
                        <!-- 二级分类 -->
                        <dd class="c-s-dl-li">
                            <ul class="clearfix">
                                <li v-for="(item,index) in subSubjectList" :key="index" :class="{active:twoIndex == index}">
                                    <a :title="item.title" href="#" @click="searchTwo(item.id, index)">{{item.title}}</a>
                                </li>
                            
                            </ul>
                        </dd>
                    </dl>
                    <div class="clear"></div>
                </section>
                <div class="js-wrap">
                    <section class="fr">
                        <span class="c-ccc">
                        <i class="c-master f-fM">1</i>/
                        <i class="c-666 f-fM">1</i>
                        </span>
                    </section>
                    <!-- 排序方式 -->
                    <section class="fl">
                        <ol class="js-tap clearfix">
                            <li :class="{'current bg-orange':buyCountSort!=''}">
                                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                                    <span :class="{hide:buyCountSort==''}">↓</span>
                                </a>
                            </li>
                                <li :class="{'current bg-orange':gmtCreateSort!=''}">
                                    <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                                        <span :class="{hide:gmtCreateSort==''}">↓</span>
                                    </a>
                                </li>
                            <li :class="{'current bg-orange':priceSort!=''}">
                                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                                    <span :class="{hide:priceSort==''}">↓</span>
                                </a>
                            </li>
                        </ol>
                    </section>
                </div>
                <div class="mt40">
                    <!-- /无数据提示 开始-->
                    <section class="no-data-wrap" v-if="data.total == 0">
                        <em class="icon30 no-data-ico">&nbsp;</em>
                        <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
                    </section>
                    <!-- /无数据提示 结束-->
                    <article class="comm-course-list" v-if="data.total != 0">
                        <ul class="of" id="bna">
                            <li v-for="item in data.records" :key="item.id">
                                <div class="cc-l-wrap">
                                    <section class="course-img">
                                        <img :src="item.cover"
                                             class="img-responsive" :alt="item.title">
                                        <div class="cc-mask">
                                            <a :href="'/course/' + item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                                        </div>
                                    </section>
                                    <h3 class="hLh30 txtOf mt10">
                                        <a :href="'/course/' + item.id" :title="item.title" class="course-title fsize18 c-333">{{item.title}}</a>
                                    </h3>
                                    <section class="mt10 hLh20 of">
                                        <span class="fr jgTag bg-green">
                                        <i class="c-fff fsize12 f-fA">{{Number(item.price) === 0 ? "免费" : "￥" + item.price}}</i>
                                        </span>
                                        <span class="fl jgAttr c-ccc f-fA">
                                        <i class="c-999 f-fA">9634人学习</i>

                                        <i class="c-999 f-fA">9634评论</i>
                                        </span>
                                    </section>
                                </div>
                            </li>
                        </ul>
                        <div class="clear"></div>
                    </article>
                </div>
                <!-- 公共分页 开始 -->
                <div>
                    <div class="paging">
                        <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
                        <!-- @click用来阻止a标签的跳转行为，变为执行click的方法 -->
                        <a :class="{undisable: !data.hasPrevious}" href="#" title="首页" @click.prevent="gotoPage(1)">首页</a>
                        <a :class="{undisable: !data.hasPrevious}" href="#" title="前一页" @click.prevent="gotoPage(data.current-1)">&lt;</a>
                        <a v-for="page in data.pages" :key="page" :class="{current: data.current == page, undisable: data.current == page}"
                            :title="'第'+page+'页'" href="#" @click.prevent="gotoPage(page)">{{ page }}</a>
                        <a :class="{undisable: !data.hasNext}" href="#" title="后一页" @click.prevent="gotoPage(data.current+1)">&gt;</a>
                        <a :class="{undisable: !data.hasNext}" href="#" title="末页" @click.prevent="gotoPage(data.pages)">尾页</a>
                        <div class="clear"/>
                    </div>
                </div>
                <!-- 公共分页 结束 -->
            </section>
        </section>
        <!-- /课程列表 结束 -->
    </div>
</template>
<script>
import courseApi from '@/api/course'

export default {
    data() {
        return {
            page:1,//当前页
            data:{},//课程的列表
            subjectNestedList: [], // 一级分类列表
            subSubjectList: [], // 二级分类列表

            searchObj: {}, // 查询表单对象

            oneIndex:-1,
            twoIndex:-1,
            buyCountSort:"",
            gmtCreateSort:"",
            priceSort:""
        }
    },
    created() {
        this.initCourseFirst();
        this.initSubject();
    },
    methods:{
        //1.查询第一页的数据
        initCourseFirst() {
            courseApi.getCourseList(1, 8, this.searchObj)
                .then(response => {
                    this.data = response.data.data;
                })
        },
        //2.查询所有的分类，用于显示
        initSubject() {
            courseApi.getAllSubject()
                .then(response => {
                    this.subjectNestedList = response.data.data.list;
                })
        },
        //3.分页切换方法
        gotoPage(page) {
            courseApi.getCourseList(page, 8, this.searchObj)
                .then(response => {
                    this.data = response.data.data;
                })
        },
        //4.点击一级分类，查询出对应的二级分类
        searchOne(subjectParentId, index) {
            //初始化
            this.oneIndex = index
            this.twoIndex = -1
            this.searchObj.subjectId = ''
            this.searchObj.subjectParentId = ''
            //把一级分类点击的id值赋值给searchObj
            this.searchObj.subjectParentId = subjectParentId
            this.gotoPage(1)

            //拿着点击的一级分类的id和所有的一级分类id进行比较
            //如果id相同，就从一级分类里面获取二级分类
            for(let i = 0; i < this.subjectNestedList.length; ++i) {
                var oneSubject = this.subjectNestedList[i];
                if(subjectParentId === oneSubject.id) {
                    //获取二级分类
                    this.subSubjectList = oneSubject.children;
                }
            }
        },
        //5.点击二级分类，查询出课程
        searchTwo(subjectId, index) {
            //样式生效
            this.twoIndex = index
            //查询的条件
            this.searchObj.subjectId = subjectId
            this.gotoPage(1)
        },
        //6.按照数量排序
        searchBuyCount() {
            //初始化标识变量
            this.buyCountSort = '1'
            this.priceSort = ''
            this.gmtCreateSort = ''
            //赋值给查询变量
            this.searchObj.buyCountSort = this.buyCountSort
            this.searchObj.gmtCreateSort = this.gmtCreateSort
            this.searchObj.priceSort = this.priceSort
            this.gotoPage(1)
        },
        //7.根据发布时间排序
        searchGmtCreate() {
            //初始化标识变量
            this.buyCountSort = ''
            this.priceSort = ''
            this.gmtCreateSort = '1'
            //赋值给查询变量
            this.searchObj.buyCountSort = this.buyCountSort
            this.searchObj.gmtCreateSort = this.gmtCreateSort
            this.searchObj.priceSort = this.priceSort
            this.gotoPage(1)
        },
        //8.根据价格排序
        searchPrice() {
            //初始化标识变量
            this.buyCountSort = ''
            this.priceSort = '1'
            this.gmtCreateSort = ''
            //赋值给查询变量
            this.searchObj.buyCountSort = this.buyCountSort
            this.searchObj.gmtCreateSort = this.gmtCreateSort
            this.searchObj.priceSort = this.priceSort
            this.gotoPage(1)
        }
    }
};
</script>
<style scoped>
    .active {
        background: #65d681;
    }
    .hide {
        display: none;
    }
    .show {
        display: block;
    }
</style>